Using Gio::FileMonitor for watching style changes
dpayne
parent
d7ed4f1fa8
commit
f7eca99496
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@ -1,13 +1,13 @@
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#pragma once
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#include <atomic>
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#include <condition_variable>
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#include <functional>
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#include <mutex>
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#include <string>
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#include <thread>
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#include <vector>
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#include "glibmm/refptr.h"
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#include "giomm/file.h"
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#include "giomm/filemonitor.h"
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struct pollfd;
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namespace waybar {
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@ -15,12 +15,8 @@ class CssReloadHelper {
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public:
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CssReloadHelper(std::string cssFile, std::function<void()> callback);
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~CssReloadHelper();
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virtual void monitorChanges();
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void stop();
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protected:
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std::vector<std::string> parseImports(const std::string& cssFile);
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@ -38,12 +34,16 @@ class CssReloadHelper {
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virtual std::string findPath(const std::string& filename);
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void handleFileChange(
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Glib::RefPtr<Gio::File> const& file,
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Glib::RefPtr<Gio::File> const& other_type,
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Gio::FileMonitorEvent event_type);
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private:
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std::string m_cssFile;
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std::function<void()> m_callback;
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std::atomic<bool> m_running = false;
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std::thread m_thread;
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std::mutex m_mutex;
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std::condition_variable m_cv;
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std::vector<std::tuple<Glib::RefPtr<Gio::FileMonitor>>> m_fileMonitors;
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};
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} // namespace waybar
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@ -8,8 +8,11 @@
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#include <fstream>
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#include <regex>
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#include <unordered_map>
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#include "glibmm/refptr.h"
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#include "giomm/file.h"
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#include "config.hpp"
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namespace {
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const std::regex IMPORT_REGEX(R"(@import\s+(?:url\()?(?:"|')([^"')]+)(?:"|')\)?;)");
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}
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@ -17,8 +20,6 @@ const std::regex IMPORT_REGEX(R"(@import\s+(?:url\()?(?:"|')([^"')]+)(?:"|')\)?;
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waybar::CssReloadHelper::CssReloadHelper(std::string cssFile, std::function<void()> callback)
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: m_cssFile(std::move(cssFile)), m_callback(std::move(callback)) {}
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waybar::CssReloadHelper::~CssReloadHelper() { stop(); }
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std::string waybar::CssReloadHelper::getFileContents(const std::string& filename) {
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if (filename.empty()) {
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return {};
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@ -34,21 +35,56 @@ std::string waybar::CssReloadHelper::getFileContents(const std::string& filename
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std::string waybar::CssReloadHelper::findPath(const std::string& filename) {
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// try path and fallback to looking relative to the config
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std::string result;
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if (std::filesystem::exists(filename)) {
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return filename;
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result = filename;
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} else {
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result = Config::findConfigPath({filename}).value_or("");
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}
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return Config::findConfigPath({filename}).value_or("");
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// File monitor does not work with symlinks, so resolve them
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if (std::filesystem::is_symlink(result)) {
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result = std::filesystem::read_symlink(result);
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}
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return result;
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}
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void waybar::CssReloadHelper::monitorChanges() {
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m_thread = std::thread([this] {
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m_running = true;
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while (m_running) {
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auto files = parseImports(m_cssFile);
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watchFiles(files);
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for (const auto& file : files) {
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auto gioFile = Gio::File::create_for_path(file);
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if (!gioFile) {
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spdlog::error("Failed to create file for path: {}", file);
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continue;
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}
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auto fileMonitor = gioFile->monitor_file();
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if (!fileMonitor) {
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spdlog::error("Failed to create file monitor for path: {}", file);
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continue;
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}
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auto connection = fileMonitor->signal_changed().connect(
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sigc::mem_fun(*this, &CssReloadHelper::handleFileChange));
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if (!connection.connected()) {
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spdlog::error("Failed to connect to file monitor for path: {}", file);
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continue;
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}
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m_fileMonitors.emplace_back(std::move(fileMonitor));
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}
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}
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void waybar::CssReloadHelper::handleFileChange(Glib::RefPtr<Gio::File> const& file,
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Glib::RefPtr<Gio::File> const& other_type,
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Gio::FileMonitorEvent event_type) {
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// Multiple events are fired on file changed (attributes, write, changes done hint, etc.), only
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// fire for one
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if (event_type == Gio::FileMonitorEvent::FILE_MONITOR_EVENT_CHANGES_DONE_HINT) {
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spdlog::debug("Reloading style, file changed: {}", file->get_path());
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m_callback();
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}
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});
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}
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std::vector<std::string> waybar::CssReloadHelper::parseImports(const std::string& cssFile) {
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@ -106,109 +142,3 @@ void waybar::CssReloadHelper::parseImports(const std::string& cssFile,
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imports[cssFile] = true;
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}
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void waybar::CssReloadHelper::stop() {
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if (!m_running) {
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return;
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}
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m_running = false;
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m_cv.notify_all();
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if (m_thread.joinable()) {
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m_thread.join();
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}
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}
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void waybar::CssReloadHelper::watchFiles(const std::vector<std::string>& files) {
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auto inotifyFd = inotify_init1(IN_NONBLOCK);
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if (inotifyFd < 0) {
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spdlog::error("Failed to initialize inotify: {}", strerror(errno));
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return;
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}
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std::vector<int> watchFds;
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for (const auto& file : files) {
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auto watchFd = inotify_add_watch(inotifyFd, file.c_str(), IN_MODIFY | IN_MOVED_TO);
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if (watchFd < 0) {
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spdlog::error("Failed to add watch for file: {}", file);
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} else {
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spdlog::debug("Added watch for file: {}", file);
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}
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watchFds.push_back(watchFd);
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}
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auto pollFd = pollfd{inotifyFd, POLLIN, 0};
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while (true) {
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if (watch(inotifyFd, &pollFd)) {
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break;
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}
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}
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for (const auto& watchFd : watchFds) {
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inotify_rm_watch(inotifyFd, watchFd);
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}
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close(inotifyFd);
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}
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bool waybar::CssReloadHelper::watch(int inotifyFd, pollfd* pollFd) {
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auto pollResult = poll(pollFd, 1, 10);
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if (pollResult < 0) {
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spdlog::error("Failed to poll inotify: {}", strerror(errno));
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return true;
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}
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if (pollResult == 0) {
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// check if we should stop
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if (!m_running) {
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return true;
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}
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std::unique_lock<std::mutex> lock(m_mutex);
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// a condition variable is used to allow the thread to be stopped immediately while still not
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// spamming poll
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m_cv.wait_for(lock, std::chrono::milliseconds(250), [this] { return !m_running; });
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// timeout
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return false;
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}
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if (static_cast<bool>(pollFd->revents & POLLIN)) {
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if (handleInotifyEvents(inotifyFd)) {
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// after the callback is fired we need to re-parse the imports and setup the watches
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// again in case the import list has changed
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return true;
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}
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}
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return false;
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}
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bool waybar::CssReloadHelper::handleInotifyEvents(int inotify_fd) {
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// inotify event
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auto buffer = std::array<char, 4096>{};
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auto readResult = read(inotify_fd, buffer.data(), buffer.size());
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if (readResult < 0) {
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spdlog::error("Failed to read inotify event: {}", strerror(errno));
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return false;
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}
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auto offset = 0;
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auto shouldFireCallback = false;
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// read all events on the fd
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while (offset < readResult) {
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auto* event = reinterpret_cast<inotify_event*>(buffer.data() + offset);
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offset += sizeof(inotify_event) + event->len;
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shouldFireCallback = true;
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}
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// we only need to fire the callback once
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if (shouldFireCallback) {
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m_callback();
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return true;
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}
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return false;
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}
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@ -124,65 +124,3 @@ TEST_CASE_METHOD(CssReloadHelperTest, "parse_imports", "[util][css_reload_helper
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REQUIRE(files.empty());
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}
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}
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TEST_CASE("file_watcher", "[util][css_reload_helper]")
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{
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SECTION("file does not exist")
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{
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std::atomic<int> count;
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std::string f1 = std::tmpnam(nullptr);
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waybar::CssReloadHelper helper(f1, [&count](){++count;});
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helper.monitorChanges();
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std::this_thread::sleep_for(std::chrono::milliseconds(100));
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CHECK(count == 0);
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helper.stop();
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std::remove(f1.c_str());
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}
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SECTION("file exists")
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{
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std::atomic<int> count;
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std::string f1 = std::tmpnam(nullptr);
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std::ofstream(f1) << "body { color: red; }";
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waybar::CssReloadHelper helper(f1, [&count](){++count;});
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helper.monitorChanges();
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std::this_thread::sleep_for(std::chrono::milliseconds(100));
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CHECK(count == 0);
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std::this_thread::sleep_for(std::chrono::milliseconds(100));
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std::ofstream(f1) << "body { color: blue; }";
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std::this_thread::sleep_for(std::chrono::milliseconds(100));
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CHECK(count == 1);
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helper.stop();
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std::remove(f1.c_str());
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}
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SECTION("multiple files")
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{
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std::atomic<int> count;
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std::string f1 = std::tmpnam(nullptr);
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std::string f2 = std::tmpnam(nullptr);
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std::ofstream(f1) << ("@import '" + f2 + " ';");
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std::ofstream(f2) << "body { color: red; }";
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waybar::CssReloadHelper helper(f1, [&count](){++count;});
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helper.monitorChanges();
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std::this_thread::sleep_for(std::chrono::milliseconds(100));
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CHECK(count == 0);
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std::this_thread::sleep_for(std::chrono::milliseconds(100));
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std::ofstream(f2) << "body { color: blue; }";
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std::this_thread::sleep_for(std::chrono::milliseconds(100));
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CHECK(count == 1);
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helper.stop();
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std::remove(f1.c_str());
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std::remove(f2.c_str());
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}
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}
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